=~ 13 = 
time of oviposition. A study of microtome sections of galls reveals that 
vaginicola, like tritici, places its eggs in the vascular bundle, but al- 
ways in the upper node. At the time the eggs are laid the tissues in 
which they are placed have not differentiated from the main stem. The 
developing embryonic head is at that time a millimeter or two above the 
joint where the eggs are placed. The sheath differentiates from the stem 
Shortly after the eggs are laid and hypertrophied tissue appears about the 
egg within a day of its presence. Ina normal leaf the sheath, after be- 
coming differentiated from the stem, appears as a collar around the main 
stem, which eventually splits. The developing gall prevents the normal 
splitting of the skeath to the node, leaving a collar around the stem 
which constricts the developing head.. Many of these heads never is- 
sue from the leaf sheath. The fact that oviposition by H. vaginicola is 
limited to the upper leaf sheath and requires the plants to be in a defi- 
nite stage of development, a stage in which the plant remains for only a 
very short period of time, is undoubtedly responsible for the fact that 
the species never becomes very abundant." 

COTTON INSECTS 
Cotton yields increased by calcium-arsenate treatment.--H. C. Young, 
Eufaula, Okla., submits a detailed report on crop production in relation 
to molasses mixture, calcium arsenate, or combinations of these. The fol- 
lowing results are culled from his report, the per acre cost and the gain 
rer acre in pounds being indicated: 
Arsenical treatment with one presquare application of molasses: 
10 plats-- 7.75 applications calcium arsenate--5,.71-- 560 pounds 
4 plats-—- 7.0 applications calcium arsenate——-#3.50-~— 439 pounds 
2 plats--10.5 applications calcium arsenate——$5.25-- 619 pounds 
(2 plats-- 5.5 applications calcium arsenate——$2.80-— 507 pounds 
Treatments with molasses only: 
4 plats--7.75 applications, weekly—-$2.81--123 pounds 
2 plats--same, weekly for season —-$3.02--129 pounds 
2 plats—-same at 3-day or 4-day intervals—-$5.06--252 pounds 
2 plats--4.5 applications only—-$1.73--213 pounds 
The value of the presquare applications of molasses, when followed 
by arsenical treatments, was shown in 4 plats by a gain of 57 pounds per 
acre with a cost of $0.50 per acre. 
Field cricket has many molts.—-"The exact determination of the num 
ber of molts of this cricket (Gryllus assimilis Fab.) has been a diffi- 
cult matter," states J. W. Folsom, Tallulah, La., "owing to the fact that 
the cricket almost always eats its cast skin. Beginning July 15, there— 
fore, each of the crickets was marked (with the assistance ORAP. Ena 
Woke and P. M. Gilmer) with a minute spot of aluminum paint on the pro- 

